I have an old steel contractor’s square that is not quite square; it’s a little less than 90 degrees. Before I buy/make one, I would like to know if someone has a (good) suggestion how to true it.
A salesman at one of the local woodworking specialty stores suggested that I try using a machinist’s punch (punching a small dent) at the inside corner of the square. The theory is that it would spead the metal and push the two arms apart. It didn’t work.
Any other suggestions?
Thanks for your help.
Replies
Bert,
Use a ball peen hammer. Lightly tap the flat side of the square on an anvil or other solid metal under layment.
Lightly tapping at the outer corner will reduce the inner and outer angles. Tapping at the inner corner will open up the angles.
Rich
Bert,
I don't know what you did, but not twenty minutes ago I straightened a square using that same method. I used a punch, and put two dings in one side, as close to the corner as I could get it, and one on the other side. It's now square.
Mine too was not quite ninety degrees. I've straightened one that was more than ninety with the same method; but to close the angle required more dings than it does to open the angle.
Before I did anything else, I'd try the punch again.
Alan
The old standard punch method is the best way. Use the little prick punch (can I say that ?) for fine tuning and a big fat, flatter angled, punch for major moves. Keep in mind though that metal is easy to stretch, and a mother to shrink.
Are you absolutely sure of your reference? Why? As a nail banger of the old school , any framing square that, when reversed, indicated a "fair" degree of squareness, was just fine for rafters and such.
The best way? Using just the hammer, with no punch, also works, and I think the square looks better without the punch marks.
Bert, I just spent about 5 hours fixing a set of stair stringers that I laid out with a bad framing square. I had just tuned it but it went right back to being bad within a couple of hours in the hot sun. I replaced it with a new one for $17.00.
You can try to fix it if you want but the cost of a new one is far less then the cost of the errors a bad one will cause.
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